ANTI-THEFT ALARM: The cycling security alarm can make a loud sound(115 dB) to draw people's attention and deter the thieves. Distance in the open, the remote control operating distance up to 50m(164 feet), find your bike location through light or sound. SMART BRAKE SENSING & LIGHT PERCEPTION: Designed with the brake sensor, Automatic ultra bright brake light will automatically after .The bicycle light is super bright and highly visible from a distance, really catch attention to enhance your safety. If you drive in a dark environment, the taillights will automatically . After leaving the dark room, if the bicycle does not vibrate for , the taillights turn off automatically. MULTIFUNCTIONAL REAR BIKE LIGHTS: Easy to install. Designed with bike alarm, COB and 200 degree wide angle design, the led rear bicycle light will make you more visible for other road users in dark night or daytime. Keeping you safe at all . It also can be used as helmet lights, backpack lights, warning lights and more. IPX65 WATERPROOF & USB RECHARGABLE: IPX65 waterproof rating, 't worry about splashing puddles or rainy weather. Built-in 800mAh Polymer Lithium battery comes with a USB cord that charges from your computer, wall charger, power bank or any other device with a USB port. After charging for 3 hours, the tail light can work for 20-40 hours in 3 different modes. (Slow flash-40h, Breathing flash-30h, Steady on-20h). Model: A8 Remote Control Battery: 12V/27A, Alkaline battery colour: black Material: ABS+PC+Stainless steel size: Light size: 50x43x42mm, remote control size: 58x35x15mm Package Contents: 1 x + Taillight bracket 1 x Remote Control 2 x Mounting bracket 1 x Plastic Strap 1 x Square gasket 1 x USB Charging Cable 2 x Installation tool (+small) 1 x Chinese and English instructions Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.